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  1. Minecraft: Java Edition
  2. MC-509

Exception in server tick loop :: ConcurrentModificationException

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Cannot Reproduce
    • Affects Version/s: Minecraft 1.4.2, Minecraft 1.4.6, Minecraft 1.4.7, Minecraft 1.5, Minecraft 1.6.1, Minecraft 1.8
    • Fix Version/s: Minecraft 1.6.2
    • Labels:
    • Confirmation Status:
      Community Consensus
    • Game Mode:
      Survival

      Description

      It was not obvious what precipitated this crash. There were several cheaters attempting to fly, but they would get automatically kicked and nothing obvious seemed to go wrong after that. Then, out of nowhere, the server crashed.

      An administrator did perform an RCON command right before the exception. This may or may not be related. The RCON command was:

      give <player name> 394 16
      ---- Minecraft Crash Report ----
      // Don't be sad, have a hug! <3
      
      Time: 10/25/12 9:46 AM
      Description: Exception in server tick loop
      
      java.util.ConcurrentModificationException
              at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
              at java.util.HashMap$KeyIterator.next(HashMap.java:928)
              at hz.a(SourceFile:90)
              at net.minecraft.server.MinecraftServer.r(SourceFile:721)
              at hg.r(SourceFile:233)
              at net.minecraft.server.MinecraftServer.q(SourceFile:661)
              at net.minecraft.server.MinecraftServer.run(SourceFile:595)
              at fp.run(SourceFile:818)
      
      Relevant Details:
      - Minecraft Version: 1.4.2
      - Operating System: Mac OS X (x86_64) version 10.8.1
      - Java Version: 1.7.0_07, Oracle Corporation
      - Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
      - Memory: 703529376 bytes (670 MB) / 3221225472 bytes (3072 MB) up to 3221225472 bytes (3072 MB)
      - JVM Flags: 5 total; -Xmx3G -Xms3G -Xloggc:server_gc.log -XX:+UseG1GC -XX:+DisableExplicitGC
      - AABB Pool Size: 24234 (1357104 bytes; 1 MB) allocated, 20708 (1159648 bytes; 1 MB) used
      - Is Modded: Unknown (can't tell)
      - Profiler Position: N/A (disabled)
      - Vec3 Pool Size: 37661 (2109016 bytes; 2 MB) allocated, 19642 (1099952 bytes; 1 MB) used
      - Player Count: 9 / 20
      - World swim2 Players: 0 total; []
      - World swim2 Chunk Stats: ServerChunkCache: 0 Drop: 0
      - Type: Dedicated Server

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              • Assignee:
                Unassigned
                Reporter:
                inertia Anthony Martin
              • Votes:
                1 Vote for this issue
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                Dates

                • Created:
                  Updated:
                  Resolved:
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